CVE-2025-4439
HIGH 7.7 ALL-YEARSAn issue has been discovered in GitLab CE/EE affecting all versions from 15.10 before 18.0.5, 18.1 before 18.1.3, and 18.2 before 18.2.1 that could have allowed an authenticated user to perform cross-site scripting attacks when the instance is served through certain content delivery networks.
Severe if exploited (CVSS 7.7), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 20th percentile
Impact if exploited
7.7CVSS 3.1 · HIGH · CNA
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ⚠User interaction: A user must take an action (click / open a file)
- ⚠Complexity: Needs a race window or specific setup
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
Search GitHub now — results may be empty or unverified.
Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-79: : Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Gitlab | Gitlab | ≥ 15.10.0 and < 18.0.5 |
| Gitlab | Gitlab | ≥ 15.10.0 and < 18.0.5 |
| Gitlab | Gitlab | ≥ 18.1.0 and < 18.1.3 |
| Gitlab | Gitlab | ≥ 18.1.0 and < 18.1.3 |
| Gitlab | Gitlab | 18.2 |
| Gitlab | Gitlab | 18.2 |
All CVSS metrics
- HIGH 7.7 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N - HIGH 7.7 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N - MEDIUM 5.4 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://hackerone.com/reports/3120111 CVE record · GitLab · Updated 2025-07-23T18:09:17.968Z
NVD · CVE-2025-4439 · Updated 2026-06-17T09:33:15.217
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-22463 EUVD · EUVD-2025-22463
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/issues/541177 CVE record · GitLab · Updated 2025-07-23T18:09:17.968Z
NVD · CVE-2025-4439 · Updated 2026-06-17T09:33:15.217
Sources: NVD · CVE.org · All sources and attribution · EPSS